package com.nowcoder.community.controller;

import com.nowcoder.community.entity.Event;
import com.nowcoder.community.entity.Page;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.event.EventProducer;
import com.nowcoder.community.service.FollowService;
import com.nowcoder.community.service.UserService;
import com.nowcoder.community.util.CommunityConstant;
import com.nowcoder.community.util.CommunityUtil;
import com.nowcoder.community.util.HostHolder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.List;
import java.util.Map;

@Controller
public class FollowController implements CommunityConstant {
    @Autowired
    private FollowService followService;
    @Autowired
    private HostHolder hostHolder;
    @Autowired
    private UserService userService;
    @Autowired
    private EventProducer eventProducer;
//关注
    @RequestMapping(path = "/follow",method = RequestMethod.POST)
    @ResponseBody
    public String follow(int entityType,int entityId){
        User user = hostHolder.getUser();
//拦截器 未登录不准关注
        //关注
        followService.follow(user.getId(), entityType,entityId);
        //触发关注事件 当前关注只有用户关注setEntityUserId(entityId)
        Event event = new Event().setTopic(TOPIC_FOLLOW)
                .setUserId(user.getId())
                .setEntityType(entityType)
                .setEntityId(entityId)
                .setEntityUserId(entityId);
        eventProducer.fireEvent(event);

        return CommunityUtil.getJSONString(0,"已关注！");

    }
//取消关注
    @RequestMapping(path = "/unfollow",method = RequestMethod.POST)
    @ResponseBody
    public String unfollow(int entityType,int entityId){
        User user = hostHolder.getUser();
//拦截器 未登录不准关注
        //关注
        followService.unfollow(user.getId(), entityType,entityId);
        return CommunityUtil.getJSONString(0,"已取消关注！");
    }

    //查询关注列表
    @RequestMapping(path = "/followees/{userId}",method = RequestMethod.GET)
    public String getFollowees(@PathVariable("userId") int userId, Page page, Model model){
        User user = userService.findUserById(userId);
        if (user == null){
            throw new IllegalArgumentException("该用户不存在");
        }
        model.addAttribute("user",user);

        page.setLimit(5);
        page.setPath("/followees/" + userId);
        page.setRows((int) followService.findFolloweeCount(userId, CommunityConstant.ENTITY_TYPE_USER));

        List<Map<String ,Object>> userList = followService.findFollowees(userId,page.getOffset(),page.getLimit());
        if (userList != null){
            for (Map<String,Object> map:userList){
                User u = (User) map.get("user");
                map.put("hasFollowed",hasFollowed(u.getId()));
            }
        }
        model.addAttribute("users",userList);

        return "/site/followee";
    }
    //查询粉丝列表
    @RequestMapping(path = "/followers/{userId}",method = RequestMethod.GET)
    public String getFollowers(@PathVariable("userId") int userId, Page page, Model model){
        User user = userService.findUserById(userId);
        if (user == null){
            throw new IllegalArgumentException("该用户不存在");
        }
        model.addAttribute("user",user);

        page.setLimit(5);
        page.setPath("/followers/" + userId);
        page.setRows((int) followService.findFollowerCount(ENTITY_TYPE_USER,userId));

        List<Map<String ,Object>> userList = followService.findFollowers(userId,page.getOffset(),page.getLimit());
        if (userList != null){
            for (Map<String,Object> map:userList){
                User u = (User) map.get("user");
                map.put("hasFollowed",hasFollowed(u.getId()));
            }
        }
        model.addAttribute("users",userList);

        return "/site/follower";
    }
    //判断用户是否关注他人列表中用户
    private boolean hasFollowed(int userId){
        if (hostHolder.getUser() == null){
            return false;
        }
        return followService.findFolloweeStatus(hostHolder.getUser().getId(),ENTITY_TYPE_USER,userId);
    }

}
